Power bank



FIG. 1 is a right, top and front perspective view of a power bank showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a right, top and rear perspective view with a lid in an open configuration thereof.

The broken lines in the drawings are for the purpose of illustrating portions of the power bank that form no part of the claimed design. 

CLAIM The ornamental design for a power bank, as shown and described. 